Barbara
Smigel's Free Online Course
- Barbara is a great teacher (professor really!) and has
been generous enough to post the information she uses to teach her
gemology course at the College of Southern Nevada online. It can
also be taken for credit through their distance education program.

Gemology Made
Easy - This is part
of The Gemology Project. Not only offers great tutorials but also
interviews with some of the worlds top professionals in gemology.